http://www.avermedia.com/Product/ProductDetail.aspx?Id=571

Your game machine can be your gameplay recorder now. With the help of H.264 hardware encoder, the Live Gamer HD allows you to record your PC game footages on the same machine without draining the system resources. The gaming performance will not be affected and the gameplay can be preserved without frame drop.

Besides, the Live Gamer HD has both input and output on the board to deliver real-time gaming experience while capturing in the background. The Live Gamer HD is designed definitely for PC gamers. It supports a wide range of graphics card's resolutions and HDMI/DVI input. The USB-interfaced Hot Button improves the accuracy and speed for capturing specific in-game scenes. Besides recording HD gameplay, the accompanying capture application "RECentral" can even let you record voice commentary at the same time. Even better, if you want to show off how good you are on the Internet, the RECentral is also capable of streaming live gameplay on to TwitchTV.